Fix QWidget::mapTo/FromGlobal() when embedded in QGraphicsView.

Map the positions via QGraphicsScene and the first QGraphicsView
(as is done in existing code). Fall back to the previous code
path when no QGraphicsView exists, which is hit in the tests.

Change-Id: I0754765d05cded6bc1b64045f2513fef8afde337
Task-number: QTBUG-41135
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>
Fix title font of Vista-style wizards.

Reverse invalid check.

Task-number: QTBUG-41878
Change-Id: I05015407e5cfad94aca65594962b897a1d0a0cbd
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>